See this thread https://discussions.apple.com/thread/6992950?start=0&tstart=0
I have updated already and experience a problem where all my AF101 AVCHD files rewrapped in Clipwrap and optimised for FCPX playback as a black screen with audio in the viewer,
Its a known issue that seems to be affecting all Panasonic AVCHD camera files - users are reporting it with AC160/130 HMC150 and AF100 - I'm guessing it will affect GH2/3/4 etc also
really big problem, hopefully to be fixed soon
Perhaps this is a new MacPro 2013 problem - tested on my Macbook Pro 2008 model and working ok
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